Equity (Tables)

9 Months Ended

Sep. 30, 2019

Equity

Summary of changes in Shareholders' Equity

The changes in shareholder’s equity for the three and nine months ended September 30, 2019 as follows:

				Additional				Total
	Common Stock			Paid- In		Accumulated		Shareholders’
	Shares		Amount	Capital		Deficit		Equity (Deficit)
Balance, December 31, 2018	33,265,629	$	33	$	428,729	$	(337,177)	$	91,585
Exercise of common stock options	18,693		—		246		—		246
Issuance for employee stock purchase plan	32,826		—		444		—		444
Vesting of restricted stock units ("RSUs")	101,483		—		—		—		—
Shares withheld for employee taxes upon vesting of RSUs	(33,503)		—		(488)		—		(488)
Stock-based compensation	—		—		4,263		—		4,263
Net loss	—		—		—		(9,700)		(9,700)
Balance, March 31, 2019	33,385,128	$	33	$	433,194	$	(346,877)	$	86,350
Exercise of common stock options	8,218		—		58		—		58
Vesting of RSUs	26,304		—		—		—		—
Shares withheld for employee taxes upon vesting of RSUs	(3,097)		—		(35)		—		(35)
Stock-based compensation	—		—		4,162		—		4,162
Net loss	—		—		—		(4,712)		(4,712)
Balance, June 30, 2019	33,416,553	$	33	$	437,379	$	(351,589)	$	85,823
Exercise of common stock options	25,271		—		232		—		232
Issuance for employee stock purchase plan	41,316		1		372		—		373
Vesting of RSUs	57,818		—		—		—		—
Shares withheld for employee taxes upon vesting of RSUs	(17,100)		—		(198)		—		(198)
Stock-based compensation	—		—		4,137		—		4,137
Net loss	—		—		—		(6,109)		(6,109)
Balance, September 30, 2019	33,523,858	$	34	$	441,922	$	(357,698)	$	84,258

The changes in shareholder’s equity for the three and nine months ended September 30, 2018 were as follows:

				Additional				Total
	Common Stock			Paid- In		Accumulated		Shareholders’
	Shares		Amount	Capital		Deficit		Equity (Deficit)
Balance, December 31, 2017	32,770,678	$	33	$	402,096	$	(298,049)	$	104,080
Exercise of common stock options	183,987		—		2,373		—		2,373
Issuance for employee stock purchase plan	50,151		—		510		—		510
Vesting of RSUs	32,573		—		—		—		—
Shares withheld for employee taxes upon vesting of RSUs	(9,810)		—		(216)		—		(216)
Stock-based compensation	—		—		2,728		—		2,728
Net loss	—		—		—		(18,652)		(18,652)
Balance, March 31, 2018	33,027,579	$	33	$	407,491	$	(316,701)	$	90,823
Exercise of common stock options	137,419		—		1,532		—		1,532
Vesting of RSUs	20,887		—		—		—		—
Shares withheld for employee taxes upon vesting of RSUs	(6,205)		—		(140)		—		(140)
Stock-based compensation	—		—		3,526		—		3,526
Net loss	—		—		—		(13,060)		(13,060)
Balance, June 30, 2018	33,179,680	$	33	$	412,409	$	(329,761)	$	82,681
Exercise of common stock options	13,619		—		182		—		182
Issuance for employee stock purchase plan	36,778		—		607		—		607
Vesting of RSUs	21,125		—		—		—		—
Shares withheld for employee taxes upon vesting of RSUs	(6,176)		—		(114)		—		(114)
Stock-based compensation	—		—		3,926		—		3,926
Net loss	—		—		—		(16,502)		(16,502)
Balance, September 30, 2018	33,245,026	$	33	$	417,010	$	(346,263)	$	70,780